COMPRESSION FATIGUE CRACK GROWTH BEHAVIOUR OF AN ALUMINIUM ALLOY: EFFECT OF OVERLOADING |
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Authors: | Y. N. Lenets |
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Affiliation: | Institute for Materials Research, GKSS Research Center, Max-Planck-Street, D-21502 Geesthacht, Germany |
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Abstract: | Abstract— The behaviour of fatigue cracks in an Al-alloy under cyclic compression, either with or without overloads, was studied. For constant-amplitude compressive cycling, a non-catastrophic (saturation) character of the fatigue crack behaviour was confirmed, with the final depth of a crack depending on the applied load level. Single (tensile or compressive) intermittent overloads were shown to re-activate a previously arrested crack while reversed (tensile—compressive or compressive—tensile) ones were also shown to maintain continual fatigue crack extension under otherwise fully compressive cycling. |
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Keywords: | Aluminium alloy Fatigue crack growth Cyclic compression Overload Residual stress Crack tip blunting |
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